Unstructured Mesh Generation For Viscous Flow Computations

This paper presents a robust and automated approach to generate unstructured hybrid grids comprised of tetrahedra, prisms, and pyramids for high Reynolds number flow computations. The hybrid mesh generation starts with isotropic tetrahedral grids to enhance the robustness. The tetrahedra near no-slip walls are shifted inward and the resulting gap between the tetrahedra and the walls is filled up with prismatic elements. The addition of prismatic elements is locally stopped if negative volume elements are created. The method is demonstrated for scaled experimental supersonic airplane models designed at the National Aerospace Laboratory of Japan (NAL) and an Aero-Train model designed at the Institute of Fluid Science, Tohoku University.

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